To Set WebMail as your default Mail Client:
(This allows you to open webmail to send a message when you click on a link.)

• Once you are logged in with your username and password
• Click 'Preferences' (top right corner)

• Click 'Other' on the left  (Note: Click the picture for a larger image)
  

• Click the 'Make Default' Button
• Click 'Save & Close' (on the top of the window)